一辆自行车降价后卖了168元,比原价降低了20%,原价是多少元?
168÷(1-20%)
=168÷80%
=210(元)
答:原价是210元.
煤层注水有什么技术指标吗?
_________ seems no sense in complaining.We should take action now.
A.That
B.This
C.It
D.There